This is one that is documented in a few forums, but there does not seem to be a solution. The issue comes from a internal voltage step down and is increasingly a problem with higher input volts. Meaning powering it on 3S is much worse then 2S. The goggles have a ton of potential because the screen is very nice. Mellow flights are very enjoyable, but dodging branches and quick moments amplify the effect of the lines.
I figured id post up here since a few of you use them and probably have already fixed them. I know IBCrazy uses these and im certain he dosnt put up with a engineering problem lol.